in this video we will learn how to use sudo command in linux.
The sudo facility allows specified users to run specific commands as root without having to know the root password.
sudo uses the configuration file /etc/sudoers

Processes and Files
UNIX is built upon processes and files. A process is basically an executing program. All the work performed by a UNIX system is carried out by processes.
All the long term information stored on a UNIX system is stored in files. Every file on a UNIX system has a number of attributes that serve different purposes.
There are a collection of commands that allow users and SA’s to to manipulate files and processes.

Whenever you run a program, a process is created. The UNIX command line that you use to enter the commands is actually another program/command called the shell.
To execute a command, that command has to be in one of the directories in your search path.

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